Lock nut



Nov. 29, 192i LOCK NUT Patented 'Nov. 29, 1 927.

JOHN P. GILMOUR, OF TERRE HAUTE, INDIANA.

LOCK NUT.

Applicationrled January 26,` 1925. Serial No. 4,917.

My present linvention has reference to ,a means tor securely locking a nut on a bolt.

My object is ther provision ot' a nutlock in,V

which a nut is engaged by a flexible outer or lock nut in a manner to prevent either of such nuts turning in an unscrewing direction on a bolt. j

A further objectis'the provision ola nut which has'its outer face provided with radially disposed rounded ribs Vand concaved grooves betweenthe ribs and wherein a iiexible lock nut has its inner face shaped cornplementary to the outer 'tace of the main nut and whereby the ribs of the lock nut will gracefully glide into thegrooves of the main nut-when both nuts are screwed home, with the vresult that` the main nut is e'llectivelyY locked on the bolt. A f

`With the above recited obj ectsin view and others which will appear as the natureot the invention is better understood, reference is to be had to the drawings which accompany and which form part of this application.

In the drawings f 1 Figure l is an elevation ot a nut locked on y a bolt in accordance with this invention.

' Figure 2 is a cent-ral longitudinal sectional view through the construction disclosed in Figure l, the. bolt being in elevation.

Figure 3 shows a side elevation and a face view of thema-in or` standard nut.

Figure l shows an Vinner face view and side elevation of the lockingnut.

Figure 5 is a view similar to Figure 1,'but

i showing the inugrovement arranged on a bolt not provided with different hand pitch threads.r v l Passing through a substructure l there is the threaded endV of a bolt 2. In the pre-- ferred embodiment` of the improvement, the bolt 2 has its outerr end reduced and provided withthreads 3 which are of a diit'erent yhand pitch than the-main threads l. Screwed on the threads 4f ot the bolt there is a main or standard nut 6. This nut has its outer' face provided'withV radially dis.- posed rounded ribs 7 and rounded vdepressions 8 between the ribs. 'v

Screwed on the threaded endB of the bolt 4 there is a lock nut 5. rIfhis lockr nut is ap sec'ting grooves.

vand whereby thestandard nut is effectively proXimately one-half of the thickness of the main nut 6,01q may be of a less thickness and :has its inner face provided with radially disposed outwardly rounded ribs l and rounded concavities 10 between theribs. :55 The curvature of the ribs and grooves is slow, that is, the ribs are comparatively wide at the outer portions thereof as are the inter- The lock nutk, while of stamped steel is flexible so that the same, when screwed on the threads 3 of the bolt, will allow its ribs 9 to glide over the ribs T.- ot `the main or Ystandard nut and to snap into the grooves 8 of the said standard nut,

locked on the bolt. v

In Figure 5, the construction is similar to thatv described, except that the bolt `l1 has f its threaded portion of an equal diameter' throughout and the threads are of the same hand pitch. Themain or standard bolt 6 has its corrugated face engaged by the cor-v rugated face ofthe lock bolt 5 when the bolts are screwed home. By reference to the drawings it will be noted that the ribs in i both the nut. and the lock nut are equidistantly spaced, thatthe .ribs are of a length equaling that of thev grooves, and likewise -that the grooves are of a depth equaling the distanceV the ribs are projected from the nut. 80 Further it is to 'be considered that the ribs ot the improvement are not to be considered in the nature of teeth, as there is not what may be termed a biting engagement between theV walls of the cooperating ribs and grooves, but rather a frictional clamping engagement which is brought about by the resiliency ot the outer or locknut 5 or 5 anda slight resiliency or yielding of the threadsv of the bolt, with the resultthat al comparatively free gliding of the lock nut over the main nut is attained without liability of stripping the threads of the bolt. y j The simplicity of my improvement and the advantages thereof will, it is thought, 95.

be apparent to those skilled in the art to which such inventions relate.

Having described the invention, I claim A locking means Jorrbolts, comprising an A ordinary nut, having slight corrugations iny 10U its outer face, a `thin look nut formed of spring steel threaded on the bolt as the or dinary nut, corrugations formed on the inner face of the lock nut to correspond with those on the outer face of the nut, the said corrugatons being shallow and the distance between crests comparatively long so that the lock nut by reason of its resiliency will ride over the crests of the corrngzrtions until the inner face of the nut ,lock und the outer 10 face of the ordinary nut Contact at', `all points,

In testimony whereof I affix my signature.

JOHN P. GILMOUR. 

